Fix description of regex escaping mechanism
Backslash can escape any character when used outside of brackets [],s o statement in docs is invalid. Rephrased it and added small escaping example. Details in: Details in #18428 (closed)
Backslash can escape any character when used outside of brackets [],s o statement in docs is invalid. Rephrased it and added small escaping example. Details in: Details in #18428 (closed)